Ascotel® IntelliGate® 150/300 as of I7.9Operation and Maintenance 167syd-0210/1.7 – I7.9 – 12.20096. 3 Hardware updateHardware maintenance comprises replacing cards and modules when there is a de-fect or for a generation change. Safety regulations must be observed and the step-by-step procedure must be followed.6. 3. 1 PreparationsFirst steps before cards are removed or added:• Inform users• Prebar the system• Disconnect system power supply6. 3. 1. 1 Inform usersInform all concerned users if the system has to be put out of operation duringworking time.TipTo inform users, use the internal messaging system on the system termi-nals.6. 3. 1. 2 Prebar the systemPrebarring the system prevents setting up new connections. Ongoing calls are notcleared down. If a user tries to set up a call while prebarring is activated, he will ob-tain no dialling tone and the system terminal display will read "Not available"The system is prebarred in the AIMS Configuration Manager or in the Fault & Main-tenance Manager under 1_1_2 "Slot configuration": press the "Prebar system" button.The LED display on the front panel shows when the system is prebarred (seeTab. 88).Ascotel® IntelliGate® Net:In an AIN every node can be individually prebarred and unlocked again.However, only when the Master is prebarred is it displayed. The barredstate of a satellite is visible neither on the Master nor on the satellite.As soon as there are no more active connections in the prebarred system, the sys-tem can be taken out of operation.
